Double Blind Stitch Sewing Machines

No thread tension marks. Very flexible seam, invisible inside and out. Hem edge can be pressed down. The double blind stitch sewing machine with two independently adjustable, spring-loaded plungers. The material is fed through the machine in S-pleats. The needle penetrates once to the right and once to the left of the material break above it (zigzag stitch). The needle can be at any distance from the edge of the hem. It is very flexible and loose, and is invisible both inside and out. The loose seam prevents thread tension marks. On delicate materials, the hem edge can be pressed down so that the seam does not make an impression visible on the outside. When sewing over cross-seams, the plungers automatically spring down, so that the needle only stitches the upper layer of fabric. Here, the two cloth retainers operate as sensors and can be adjusted to work with the most diverse fabrics. Result: no thread take-up marks on the outside over cross-seams.